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I came up with this experiment involving __index and __newindex to
segregate a table in its array part and non-array part:


It requires an special constructor to create the table:

  t = arrayTable{1, 2, a = 1}

It requires special iterators replacing both ipairs and pairs:

  for k,v in at_ipairs(t) do print(k, v) end
  for k,v in at_pairs(t) do print(k, v) end

Alternatively you can use the indexes to the real table/array provided
in the table

  for k,v in ipairs(t.___array) do print(k, v) end
  for k,v in pairs(t.___table) do print(k, v) end

Which I believe is even more ugly than using the iterators above.

I tried to override __len on the metatable but apparently that does
not work in lua 5.1 (I read somewhere __len will be overridable for
tables/strings in 5.2?)

-------------------------------------------------------------- - Software Developer